Most of these systems use a mix of both Lunar & Solar calendars.
|Tithi||1 Day||1 Day in Lunar month**|
|Krushna Pakhya||15 Tithis||After Full Moon||Amavasya||Waning / fading moon|
|Shukla Pakhya||15 Tithis||New Moon||Purnima||Waxing moon|
|Amavaasya||No Moon Day|
|Purnima||Full Moon Day|
**The progression of the moon from full moon to new moon is divided into fifteen equal arcs. Each arc measures one lunar day, called "tithi".Tithis begin at varying times of day and vary in duration from approximately 19 to approximately 26 hours.